simple question programming arduino
hi, i have arduinos connected: pin1 (of arduino1) connected pin3 (of arduino2). pin1 (of arduino 1) output. pin3 (of arduino 2) input. i want set pin4 of arduino_2 high, when receives signal arduino_1 @ pin3. what instructions code write arduino_2? (just instructions) when send signal arduino_1, pin_3 of arduino_2 set high? i think 2 arduinos need common ground. kind of topic has been covered many times on forum. do quick search , see pops up.. lots of different ways of connecting them too, not digital pins. Arduino Forum > Using Arduino > Programming Questions > simple question programming arduino arduino